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(N o Model.)

E. F. GWYNN. K DBVIE FR REMVING SCALE FROM BILER'TUBES. No. 597,409. YPatented Jan. 18, '1898.

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UNITED STATES PATENT erica EDWARD F. GVVYNN, OF DELAIVARE, OHlO.

DEVICE FOR REMOVING SCALE FROM BOlLER-TUBES.

SPECIFICATION forming part of Letters Patent No. 597,409, dated January18, 1898.

Application tiled August 19,1897. Serial No. 648,830. (No model.)

To @ZZ whom t may con/cern:

Be it .known that` I, EDWARD F; GWYNN, a citizen of the United States,residing at Delavware, in the county of Delaware and State of Ohio, haveinvented a certainnew and useful Improvement in Devices for RemovingScale from Boiler-Tubes, of which the following is a specification.

illy invention relates to the improvement of devices for removing scalefrom boiler-tubes; and the objects of my invention are to provide asimple, reliable, and effective device of this character whereby scaleand other foreign matter which may accumulate upon the outer surface ofboiler-tubes may be easily and readily removed, to provide improvedmeans for imparting a blow or blows to the inner side or surface of aboiler-tube at right angles with the direction of the length of thetube, and to provide other improvements in details of construction andarrangement, which will be more fully pointed out hereinafter. Theseobjects I `accomplish in the manner illustrated in the accompanyingdrawings, in whicl1- Figure lis a central longitudinal section of agroup of boiler-tubes, showing myimproved device located in one of saidtubes in position for use. Fig. 2 is a central longitudinal section ofsaid device, and Fig. 8 is a plan view of the same. f

Similar letters refer to similar parts throughout the several views.

In constructing my improved scale-removing apparatus I provide acylindrical body or head @,with a rearwardly-extending neck portion a',to which is detachably connected a body extension h, theinner end ofwhich communicates with and forms a continuation of the central passageor internal longitudinal channel c of the head a. This passage orchannel c extends to a point in the forward end portion of the head, andnear said forward end portion of said passagelprovide, at right anglestherewith, one or more outwardly-eX-- tending oppositely-locatedpassages c', the passages c and c combining to form an angular passageor way which leads from the outer end of the body a outward through theforward portion of said body.

In constructing the tube l), I provide the latter at intervals withcoupling-plu gs or corevarious sections of the tube h and being providedwith comparatively small passages through their central portions, forthe purpose hereinafter described.

Arranged to slide in each of the passages c' is a hammer head or pin c,the outer end portion of the latter preferably being rounded, as shown,and projecting on the outer side of the body a. The inner end of each of'the hammers e is formed with a diagonal or beveled face, as indicatedat c. The hammers e are prevented from too great outward movementbymeans of spring-stripsf, one end ofv each of which is secured tothebody a and the remaining end of which is made to embrace or engage withthe outwardly-projectin g head portion of the hammer.

f represents a ham m er-rod which is adapted to extend Within the tubeh, said hammerrod bearing Within the comparatively small centralpassages of the coupling-plugs d. The inner end of this hammer-rod isprovided with a suitable hammer-head g. v

Within the forward end portion of the tube l) and extending within thehead a is a plunger g', the latter having its forward end portion of theWedge shape indicated at g2.

pieces d, the latter serving to unite the In utilizing theabove-described device the body c and a portion of the tubular extensionl) is inserted, as indicated in Fig. l of the drawings, within aboiler-tube 7o, after which the plunger-rod f', which is' provided witha suitable outer end handle f2, is forced backward and forward or is sooperated as to impart successive strokes of the hammer-head g on theouter end of the plunger g', thus driving the inclined faces of theforward end of the plunger against the correspondinglyshaped ends of thehammers e. It is obvious that said wedge-shaped plunger end being driveninto the V-shaped space which normally eX- ists between the inner endsof said hammers e must result in the blow of the hammer-head g beingimparted through the hammers e to the inner wall of the boiler-tubeOwing to the fact that said hammers are normally in contact with or inclose proximity to the inner surface of said tube, it is obvious thatthe blow delivered thereon is in the nature of a quick concussion orjar, which will serve to loosen and remove anyforeign matter which IOOmay cling to the outer sides Vof the boiler-- tubes. In order to directthe blows or" the hammers e at different points in the tubes, it isevident that the body CL may be `rotated Within said tube and that saidbody maybe drawn backward and forward therein as may be desired.

It is obvious that instead of employing two hammers, as indicated at c,but one of said hammers may be used and a blow therefrom imparted to butone point on the boiler-tube atatinie. It will be observed that thecoupling-plugs d will serve as bearings forl the hammer-rod andV thatthe operation of forcing said rod in and out of the body a maybeaccomplished with ease and accuracy.

From the construction and operation herein described it will be seenthat simple, reliable, and effective means are provided for looseningand removing the scale andV other foreign matter from the exteriorsurfaces of boilertubes, and that the device which I employ for thepurpose may be produced at a reasonable Y cost and may be readilyoperated by unskilled pelSOIlS.

Having now fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

In a device for removing the scale from boiler-tubes, the combinationwith a body a having a central longitudinal passage c and one or morepassages c leading outward therefrom, a hammer e arranged in each ofsaid last-named passages, springs engaging said hammers and normallyretaining the same in their innermost positions, of atubular extensionb, bearing-plugs arranged within said tubular extension as described anda hammer-rod adapted to bear and slide in passages formed in saidbearing-plugs, a hammer-head on the inner end of said hammer-rod, and aplunger in advance of said hammerhead, the latter being adapted bycontact with the inner ends of said hammers e to force the 'sameoutward, substantially as and for the purpose specified.

EDWARD F. GVYNN.

In presence of- F. A. OWEN, E. S. OWEN.

